I would like to use my old laptop as a second monitor. I would like to know if that works without Wi-Fi?
Want to see what's on your laptop on the monitor? Or something else?
Some systems have an HDMI out and in. Most laptops are not. If you need Wi-Fi, but an ad hoc Wi-Fi on.
Wants to use the laptop monitor for the representation of a PC.
which, to my knowledge, is not a laptop, would be nonsense.